---
product_id: 281802038
title: "Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant"
brand: "klein tools"
price: "$278222"
currency: COP
in_stock: true
reviews_count: 5
category: "Klein Tools"
url: https://www.desertcart.co/products/281802038-klein-tools-et40-digital-ac-dc-voltage-tester-12-240v
store_origin: CO
region: Colombia
---

# 12-240V AC range Bright LED voltage indicators 1.5-24V DC detection Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant

**Brand:** klein tools
**Price:** $278222
**Availability:** ✅ In Stock

## Summary

> ⚡ Test Smarter, Work Safer — The Klein ET40 Lights the Way!

## Quick Answers

- **What is this?** Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant by klein tools
- **How much does it cost?** $278222 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co](https://www.desertcart.co/products/281802038-klein-tools-et40-digital-ac-dc-voltage-tester-12-240v)

## Best For

- klein tools enthusiasts

## Why This Product

- Trusted klein tools brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Polarity Clarity:** Instant DC polarity detection ensures you never second-guess wiring orientation.
- • **Illuminated Insight:** Bright LEDs clearly indicate voltage type and level, even in dim or tight spaces.
- • **Smart Power Management:** Auto-off after 2 minutes conserves battery life, keeping you ready for the next job without hassle.
- • **Durability Meets Design:** Withstands 3m drops and features double insulation for professional-grade safety and longevity.
- • **Precision Voltage Range:** Accurately tests residential AC (12-240V) and low DC voltages (1.5-24V) for versatile troubleshooting.

## Overview

The Klein Tools ET40 Digital AC/DC Voltage Tester is a compact, rugged device designed for professionals and savvy DIYers alike. It accurately measures AC voltages from 12 to 240 volts and DC voltages as low as 1.5 volts, with clear LED indicators for voltage type and polarity. Built to endure drops up to 3 meters and rated CATIII 250V with double insulation, it ensures safety and reliability on every job. Auto power-off extends battery life, making it a dependable tool for residential electrical troubleshooting and verification.

## Description

Klein Tools ET40 is an Electronic AC/DC Voltage Tester. It features indicators for positive and negative DC polarity, and tests DC voltages as low as 1.5V. It tests AC voltages 12-240VAC. Excellent for checking, verifying or troubleshooting common residential electrical wiring in electrical outlets, light fixtures, doorbells and more. It operates on 2 x AAA batteries. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.

Review: This voltage tester was a must have for me. I feel more at ease putting my trust in this product than I do a voltage pen, therefore since I lost my previous tester I purchased this affordable one. Absolutely perfect for checking safe isolation and betteries. Very please with this handy pocket tester.
Review: exactly what i need , fast easy and no batteries needed so i can leave it in the car in the winter

## Features

- Voltage Tester for AC voltages from 12V to 240V AC at four useful levels aligned with commonly used residential voltages
- Tests DC voltages from 1.5V to greater than 17 to 24V at four useful levels aligned with commonly used DC voltages
- Bright LEDs illuminate to indicate the type and level of voltage detected
- Built to withstand a 9.8-Foot (3 m) drop
- Indicates polarity when measuring DC voltages.Powers off automatically after approximately 2 minutes of non-use to conserve battery life.CATIII 250V, Class 2, Double insulation

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07P45RB8S |
| ASIN  | B07P45RB8S |
| Batteries | 2 AAA batteries required. (included) |
| Batteries  | 2 AAA batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Best Sellers Rank | #152,083 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #354 in Voltage Testers |
| Color | Orange |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,580) |
| Customer reviews | 4.5 4.5 out of 5 stars (1,580) |
| Date First Available | 12 February 2019 |
| Date First Available  | 12 February 2019 |
| Department  | Unisex Adult |
| Display Style | Analog LED |
| Finish | Brushed |
| Included components | No|Tester, User Manual, and 2 x AAA Batteries |
| Is Discontinued By Manufacturer  | No |
| Item Package Quantity | 1 |
| Item Weight | 65.1 g |
| Item model number | ET40 |
| Item model number  | ET40 |
| Manufacturer | KLEIN TOOLS |
| Manufacturer  | KLEIN TOOLS |
| Material | Plastic Housing, PCB with Electronic Components |
| Measurement Accuracy | +/-0.5% |
| Part number | ET40 |
| Pattern | Solid |
| Power source type | Battery Powered |
| Product Dimensions | 13.31 x 3.86 x 2.82 cm; 65.2 g |
| Product Dimensions  | 13.31 x 3.86 x 2.82 cm; 65.2 g |
| Shape | Rectangular |
| Size | One Size |
| Special Features | DC Polarity Indicators for DC Positive, DC Negative, and Both Illuminated for AC. Tests Low DC Voltage to 1.5V. Built in Test Lead Holders on Sides of Tester. |
| Specification met | CE |
| Style | 12/240 V |
| tech_spec_battery_description_toys | 2 x AAA |

## Product Details

- **Brand:** KLEIN TOOLS
- **Colour:** Orange
- **Item weight:** 2.3 Ounces
- **Power source:** Battery Powered
- **Style:** 12/240 V

## Images

![Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant - Image 1](https://m.media-amazon.com/images/I/51i2DA8X-sL.jpg)
![Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant - Image 2](https://m.media-amazon.com/images/I/61+vAs+1wDL.jpg)
![Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant - Image 3](https://m.media-amazon.com/images/I/71Y+J-v1F+L.jpg)
![Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant - Image 4](https://m.media-amazon.com/images/I/516B2lw4sdL.jpg)
![Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant - Image 5](https://m.media-amazon.com/images/I/51h-ok2UwuL.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by J***S on 7 July 2023*

This voltage tester was a must have for me. I feel more at ease putting my trust in this product than I do a voltage pen, therefore since I lost my previous tester I purchased this affordable one. Absolutely perfect for checking safe isolation and betteries. Very please with this handy pocket tester.

### ⭐⭐⭐⭐⭐ Review
*by S***D on 6 November 2025*

exactly what i need , fast easy and no batteries needed so i can leave it in the car in the winter

### ⭐⭐⭐⭐⭐ Review
*by R***N on 23 July 2025*

Small and compact, can easily have in a pocket or small pouch. And the addition of no batteries required means less maintenance, the low price also makes it very affordable to replace should it became damaged or faulty. However I doubt the latter as klein is know for quality tools.

## Frequently Bought Together

- Klein Tools ET40 Digital AC/DC Voltage Tester, 12-240V AC, 1.5-24V DC, LED Illumination, DC Polarity, Auto Off, CATIII 250V-Class 2- Double Insulation, IP4 Dust and Water Resistant
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*Product available on Desertcart Colombia*
*Store origin: CO*
*Last updated: 2026-03-12*